Chronic otitis externa: Chronic inflammation of the skin lining the external ear canal leading to the ear drum. Can be caused by a number of problems including bacterial infection, a chronic skin disorder (eczema or seborrhea ), fungus (Aspergillosis), chronic irritation (hearing aids, Q-tips), allergy , chronic drainage from middle ear disease, a tumor (rare), or it may simply be due to a nervous habit of frequently scratching the ear.

In most patients, more than one factor may be involved. For example, a patient with eczema may subsequently develop black ear drainage. This would be suggestive of an accompanying fungus.

In diabetics or immune-suppressed individuals, chronic external otitis can become a very serious disease (malignant external otitis). Malignant external otitis is a misnomer because it is not a tumor or a cancer , but rather an aggressive bacterial (Pseudomonas) infection of the base of the skull.

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